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Sol.

Q. 8. Solid calcium oxide was taken in a container and water was added slowly to it.

(i) State the two observations made in the experiment.
(ii) Write the name and chemical formula of the product formed.

Ans. (i) Observations :

1. Calcium Oxide reacts vigorously with water.
2. the beaker becomes hot.

(ii) CaO (s) + H₂O (l) → Ca(OH)₂ (aq)
Calcium      |   Calcium hydroxide (slaked lime)
oxide

Q. 9. State Ohm’s law. Draw a circuit diagram to establish a relationship between potential difference across the two ends of a resistor and the current flowing through it.

Ans. Ohm’s law : See Q. 24 (S.A.T.), Chapter 2. [Page 137

Science 2008 Question Papers Class X
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